Ku-band MMIC phase shifter using a parallel resonator with 0.18-mu m CMOS technology

A digital 5-bit phase shifter at Ku-band is presented, which is implemented with 0.18-mu m RFCMOS technology. n-MOSFET switches and top metal microstrip lines with a first-metal ground allow the phase shifter to have small insertion losses. The proposed 90 degrees phase shifter utilizing a parallel resonator exhibits broad-band characteristics. All of the circuit components are derived to obtain a minimum phase variation at the operation frequency band. A bridged-T type phase shifter is also analyzed in view of parallel resonance using an ideal equivalent-circuit model. The conditions of the circuit elements are derived in an analytic form, which are used to obtain the broad-band phase characteristics. The fabricated 5-bit phase shifter demonstrates an overall rms phase error less than. 12 degrees from 9 to 15 GHz. Insertion losses of 14.5 dB +/- 0.5 dB and return losses less than 14 dB are obtained for 32 states at 12 GHz. The proposed 90 degrees phase shifter has performed a phase shift of 92.3 degrees +/- 3.2 degrees over 9-15 GHz.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2006-01
Language
ENG
Keywords

SWITCH

Citation

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, v.54, no.1, pp.294 - 301

ISSN
0018-9480
DOI
10.1109/TMTT.2005.860298
URI
http://hdl.handle.net/10203/1572
Appears in Collection
EE-Journal Papers(저널논문)
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